Reciprocity question and unrelated Agfa XPS 160 question

Hello:

I was looking at an Agfa Portrait XPS 160 data sheet
today and the reciprocity info struck me as based on
base 10 logarithm (neat clean curve fit).

So I plotted out how many seconds for increments of
1/4 and 1/3 f-stop increases. Round off to nearest
second :O)

f t, seconds
0.25 1.77827941
0.333 2.15443469
0.5 3.16227766
0.667 4.641588834
0.75 5.623413252
1 10
1.25 17.7827941
1.333 21.5443469
1.5 31.6227766
1.667 46.41588834
1.75 56.23413252
2 100
2.33 215.443469
2.5 316.227766
2.667 464.1588834
3 1000
-------------------
Separate question: Since I bought some of this film, I
wanted to know if anyone likes it.

I have read it's sharp but has muted almost 'pastelly'
colors and 'low contrast', does better with colors
other than blue/green, not particularly useful for
landscape.

I wonder if the small grain and good resolution is
lost on pinhole, or if it has some interesting
alternative use other than portrait, like
architectural or (unsaturated) fall colors...farm
fields, etc.

Someone posted it was good for b/w (???) I don't grasp
that; low contrast color film for b/w?

I wonder if one could get some of those images that
have so little color it' shard to tell whether it is
color or b/w.

It's ISO 160 and people say try it at 100...I guess
that's in line with the principle of slightly
overexposing color print film being better than
under-.
----------------
I know this has probably been asked before...how does
one correct reciprocity by increasing time (can't
increase f-stop)? Is only one corrrection done
(correcting the 'new' corrected time sounds wrong).

Thanks

Murray

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Received on Fri Aug 27 20:30:42 2004